CVE-2026-59898
ADVISORY - githubSummary
Summary
An attacker can force WebSocket upgrade via the lax V07 (or V08) handshaker by sending Sec-WebSocket-Version: 7 and omitting Connection: Upgrade / Upgrade: websocket headers, completing a protocol switch that a proxy would not recognize as an Upgrade request and enabling HTTP request smuggling / protocol-confusion attacks.
Common Weakness Enumeration (CWE)
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
Inconsistent Interpretation of HTTP Requests ('HTTP Request/Response Smuggling')
NIST
3.9
CVSS SCORE
6.3mediumGitHub
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CVSS SCORE
6.3mediumDebian
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Ubuntu
3.9
CVSS SCORE
7.5mediumChainguard
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